Drilling-machine



(No'Model.) 2 Sheets-Sheet 1. T. FARMER, Jr. DRILLING MACHINE.

No'. 428,884. Patented M81. 18, 1880.

2 Sheets-Sheet 2.

v (No'Model.)

T. FARMER, Jr. DRILLING MACHINE.

Patented Mar. 18, 1.890.

UNITED STATES ATnNT muon.

THOMAS FARMER, JR., OF BLOOMIGTON, ASSIGNOR TO THE IV. F. t JOHN BARNES COMPANY, OF ROOKFORD, ILLINOIS.

DRILLING--IVIACHINE.

SPECIFICATION forming part 0f Letters Patent No. 423,864, dated March 18, 1890.

Application filed November 22, 1889. Serial No. 331,154. (No model.)

T0 a/ZZ whom t may concern:

Be it known that I, THOMAS FARMER, J r., a citizen of the United States, residing at Bloomington, in the county of McLean and State of Illinois, have invented certain new and useful Improvements in Drilling-Machines, of which the following is a specification.

The object of this invention is to construct a drilling-machine having a friction-driving mechanism, so that in case the drillbe pressed too hard the friction will slip, thereby preventing the breaking of the drill and injury to the work being operated upon.

The further object of this invention is to furnish means for regulating the amount of friction applied; and the further object is to vary the speed of the drill-spindle by changing the relation of the parts comprising the friction mechanism, also the various combinations of elements hereinafter shown and described.

In the accompanying drawings, Figure l is an isometrical representation of a drill embodying my improvements. Fig. 2 is a vertical central section through the frictionwheel, drill-spindle, and yoke. Fig. 3 is a horizontal section through the yoke, showing its construction. Fig. 4 is a vertical central section of the drill represented in Fig. l, eX- cepting that a solid metal friction-wheel is employed. Fig. 5 is a side elevation, partly in section, of the drill shown at Fig. 4, eX- cepting that the face of the friction-disk is covered with an elastic material.

rIhe drill herein shown consists ot` a vertical column l, having its lower end in foot form, Which holds the drill in an upright manner. A platen 2 has an adjustable connection with this column by a split collar 3 surrounding it, and by means of the screw 4 the collar maybe clamped to the column after the platen has been adjusted. .A drill-spindle 5 of the ordinary construction is guided in its vertical and rotary movements in bearings 6 and 7. In the lower bearing is located a pinion 8,' which engages the teeth of the rack 9 of the drill-spindle, and a handle l0 furnishes the means for imparting movement to the pinion. A horizontal driving-shaft ll is supported in bearings 12`"and 13, forming a portion of the head of the drill-frame. A

disk la is secured to the end of the shaft ll, so that its face will revolve in a vertical plane. A friction-wheel l5 is splined on the drill-spindle, and in this instance consists of 5 5 a lower flange 16 and central hub 17 in one piece. A band 18, of leather, rubber, vulcanized fiber, or other suitable yielding or elastic material, is placed on the hub, and a collar 19 holds it in position. The face of 6o this wheel revolves in contact with the face of the friction-disk, and by its splined connection with the drill-spindle has a movement across the face of the disk. A yoke 2O has a connection with the friction-wheel by a series of balls 2l, surrounding the lower reduced end of the Wheel and held in place from lateral and downward displacement by a collar 22. A guide-rod 23 runs parallel with the drillspindle, and the yoke has an arm 24 surround- 7o ing this guide-rod, and by means of a combined handle and securing device 25, which has a vscrew-threaded connection with the arm 24, and, pressing against the guide-rod, the friction-wheel is raised or lowered and retained in any desired position along the drillspindle. The rear end of the bearing 13 is screw-threaded, and a thu nib-screw 26 turned therein, which comes in contact with the end of the shaft ll. By means of this thumb- 8o screw I am able to adjust the friction-disk to or from the friction-wheel to regulate the driving-power of the disk, and when properly adjusted a jamb-nut 27, turned up against the end of the bearing, will retain the desired adjustment. A pulley 28 is secured to the driving-shaft ll and by means of which it is rotated. A counter-shaft 29 is held in bearings 30, in this instance connected with the base of the drill. Upon this shaft is secured 9o a driving-pulley 3l, having a belt-connection with the pulley 2S on the driving-shaft ll. A tight pulley 32 is also secured to the countershaft, and a loose pulley 83 is mounted thereon to revolve independent of the shaft. A belt 34: connects the line-shafting with the countershaft, and is shifted onto and off of the tight and loose pulleys to start and stop the rotations of the drill-spindle.

By the above construction of a drilling-maroo chine I am able to so adjust the friction-contact between the friction wheel and disk as to permit the use of very delicate drills; and in drilling, should a hard substance be encountered, the drill will stop its rotation by reason of the friction .contact not being suflicient to revolve the drill, thereby saving the drill and Work operated upon. The point Where a drill usually breaks is just as its point is protruded through the material operated upon, and if extra pressure is brought to bear upon the drill it is likely to break or twist off; but by my arrangement the chances of breaking the drill are greatly reduced. 'When a larger drill is employed, the friction-contact between the disk and wheel is increased up to the point Where the drill can be run with safety. By the connection of the friction-wheel with the guide-rod the thrust or pressure brought to bear against the friction-Wheel is taken by the rod, thereby permitting an easy vertical movement of the drill-spindle through the Wheel. If it were not for the guide-rod, the thrust would bind the wheel in its connection with the drill-spindle. By the movement of the Wheel across the face of the disk the velocity of the drill-spindle can be governed, and as the Wheel approaches the periphery of the disk its velocity is the greatest, and as it app roaches the center of the disk it is diminished until the center is reached, when the wheel will stand still, and by continuing the movement of the wheel the direction of rotation of the drill-spindle will be reversed, slon7 at iirst, but continually increasing as it moves toward the periphery 0f the disk. I attain these movements Without stopping or reversing the rotations of the disk. In using a wheel having its face of such material as ivill more firmly adhere to the face of the disk,better results are attained.

A drill running at the velocity of the drill herein shown and described is likely to vibrate or cause a trembling in the head portion of the drill should the pulley on the driving-shaft be connected directly with the j line-shafting. I overcome all of this by the employment of the counter-shaft herein shown and described.

In the construction shown at Fig. t the friction-Wheel 35 and disk 3G are both of the same material, and in the construction shown at Fig. 5 the Wheel 37 is of metal and the disk 39 has its face 3S of yielding material to increase the friction-contact between the wheel and disk. v

All of the above constructions are within the meaning of my invention, and I therefore lay claim to such.

I claim as my inventionl. In a drilling-machine, the combination of a rotary spindle and a power-shaft, the one provided with a friction-wheel and the other provided with a friction-disk in engagement with the friction-Wheel, said wheel and disk being adjustable relatively to each other and (1o-operating to drive the drillspindle, substantially as set forth.

In a drilling-machine, the combination of a rotary spindle provided with a frictionwhcel, and a power-shaft provided with a friction-disk in engagement with the friction- \vheel on the spindle, the wheel on the spindle having an adjustment across the il'ace of the disk to regulate the velocity of the spindle, substantially as set forth.

In a drilling-machine, the combination of a rotary spindle provided with a frictionwheel, and a power-shaft provided with a friction-disk in engagement with the friction- Wheel on the spindle, the wheel cn the spindle having an adjustment across the face of the disk to regulate the velocity of the spindle, and a device for holding the wheel When adjusted, substantially as set forth.

t. In a drilling-machine, the combination of a rot-ary spindle provided With a frictionwheel, and a power-shaft provided with a friction-disk in engagement with the frictionwheel on the spindle, and a device for adjusting the shaft longitudinally to vary the force of the frictional contact between the Wheel and disk, substantially as set forth.

5. In a drilling-machine, the combination of a rotary spindle, a friction-wheel in the spindle, an actuating-shaft, a friction-disk on the shaft, pressing against the friction-Wheel on the spindle, a rod secured to the spindlesupport and extending parallel with the spindle, and a yoke having a loose connection with the friction-Wheel and a connection with the rod on the opposite side of the friction-Wheel from the friction-disk to support the Wheel against the pressure of the disk and thereby relieve the spindle, substantially as set forth.

(i. In combination, a vertical column, a rotary spindle, and an actuating-shaft mounted in the upper portion of the column, frietional mechanism connecting the rotary spindle and the actuating-shaft, and a second actuatingshaft mounted near the base of the column and connected with the shaft at the upper portion of the column and with the actuating-power, substantially as set forth.

7. In a drilling-machine, the combination of a driving-shaft, a friction-disk thereon, a drill-spindle having a friction-wheel to bear against the said disk and be rotated thereby, a yoke-and-ball bearing for the Wheel, substantially as set forth.

THOMAS FARMER, JR.

Witnesses:

A. O. BEHEL, HENRY D. SPENCER.

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